摘要
给出了一种简化的超声海流信号仿真模型,利用WVD计算其瞬时功率密度,取瞬时功率密度的最大值作为其瞬时频率的估值。仿真结果表明,高信噪比(超过30 dB)情况下可以利用WVD估计超声海流信号的瞬时频率。
A simplified simulation model of an ultrasound seawater flow signal on ADCP （Acoustic Doppler Current Profiler） is proposed, and instantaneous power spectrum of that model is obtained using the WVD （Wigner-Ville Distribution）, and instantaneous frequency of that model is obtained by the maximum of the power spectrum. Simulation results show that the WVD is applicable to instantaneous frequency estimation on the ultrasound seawater flow signal with a signal-to-noise ratio higher than 30dB.
出处
《海洋技术》
2007年第3期42-43,63,共3页
Ocean Technology
基金
国家海洋局青年海洋科学基金资助项目(2005410)
关键词
海流
瞬时频率
WVD
seawater flow
instantaneous frequency
Wigner-Ville Distribution
